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APOLLO VOLTMETER INPUTS & CONFIGURATIONS (Applies to both Apollo A.C. & D.C. voltmeters)
The simplified schematic (left) shows all of
the features that permit the Apollo Voltmeter
to cover 95% of all in-plant voltage related
measurements. The basic voltmeter range is 0
to 1.999 V. For higher voltage readout, a
multi-tap precision voltage divider can be
connected to extend the range up to 300 V. A
built-in scale adj. pot. extends the capability
of Apollo Voltmeters even further to provide
direct readout from transducers that generate
signal voltage outputs proportional to RPM,
PSI, FPM, etc. Note: When used to readout in
scaled units other than voltage, the front panel
adjustment can be used as a fine trim scaling
adjustment.
VOLTMETER RANGE CHANGE CONNECTIONS
(Polarity Indicated for D.C.)
WHERE:
VT
D.D.P
D.R.
D.F.
=
=
=
=
Maximum Transducer Output
Display Decimal Point
Desired Reading
Division Factor
D.D.P.
0.000
00.00
000.0
0000
=
=
=
=
1
10
100
1000
The Display Decimal Point
(D.D.P.) is determined by
the desired decimal point
placement in the readout.
Then we connect the divider and pot. to obtain the adjustable division range
we need to bracket the proper division factor (See “Scaling Connection
Diagrams” below) .
SCALING FOR DIRECT READOUT OF OTHER
EXAMPLE 1: A pressure transducer delivers a 5.5 V signal @ 120.0 PSI
VARIABLES
In many industrial applications, a voltage sensing instrument is required to
display a reading in terms of PSI, RPM, or some other variable. The signal
maximum.
VT x D.D.P. = 5.5 x 100 = 4.58 D.F.
D.R. 120.0
voltage being measured is normally generated by a transducer which senses the
variable and delivers a linearly proportional output voltage.
The multi-tap divider and the scale adj. pot. of the Apollo Voltmeters can be
connected in tandem (series) to scale (divide) virtually any signal voltage up to
300 V max. down to the basic 0 to 1.999 V input range to get the desired reading.
The multi-tap voltage divider provides coarse ranges of division and the scaling
This division factor falls between 1 and 12, so connect per “Diagram A”
below. Calibrate by adjusting the scaling pot. to get the proper readout at a
known pressure.
SCALING CONNECTION DIAGRAMS
(Polarity Indicated for D.C.)
pot. provides continuous selection of division factors between the taps.
Note: The normal decade division factors (÷10, ÷100, and ÷1000) have been
adjusted in this schematic to account for parallel connection of the scale pot.
resistance which increases these factors as shown.
In order to determine the jumper wiring configuration of the Apollo for a
scaled application, we must first determine the division factor required to
provide the desired display.
EXAMPLE 2: A D.C. tachometer generator delivers 210 V at maximum
210 V (Max. from tach. gen.) x 1000 (D.P.P.)
USING THE FORMULA:
VT x D.D.P. = D.F.
D.R.
3
machine speed which is to be indicated as 575 FPM on an Apollo Voltmeter.
= 365 (D.F.)
575 (Desired Readout)
This division factor falls between 105 and 1005, so connect per “Diagram
C” above. Calibrate by adjusting the scaling pot. to get the proper readout at a
known speed.
发布紧急采购，3分钟左右您将得到回复。
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